Reverse Instrument Case Mounting Position Versus To Displacer Position ( Left Or Right ); Replacement Of Elec; Components - GE Masoneilan 12420 Instruction Manual & Safety Manual

9.5. REVERSE INSTRUMENT CASE MOUNTING POSITION VERSUS TO DISPLACER POSITION (LEFT OR
RIGHT MOUNTING) (FIGURES 7, 12 13, 20, 21 and 23)
a. Follow instructions in Section 9.3 — Removing a DLT case and torque tube sub-assembly.
b. Install the case/torque tube subassembly on the opposite side of mechanism chamber in place of flange (144) and open
the cover (107) of the mechanism compartment. It is recommended that you install a new gasket (143) when
reassembling
c. Using a 2.5 mm hex wrench, loosen the screw (62) of beam (54) to uncouple it from the torque rod.
d. Replace the displacer in the chamber (131) or in the tank and hold it temporarily with a 3 mm steel hook.
e. Insert the torque arm (135) into the mechanism chamber and assemble it to plate (134) with two screws (133).
f. Lower the free end of the torque arm (135) and hook the displacer (130). Reassemble the top flange (146) and blind
flange (144) using new gaskets (149 & 143).
g. Open the cover (255) located in front of the instrument to gain access to the pushbuttons (260).
h. Enter the BASIC SETUP menu then [CONFIG] and select the required configuration data corresponding to the new
instrument position.
i. Perform the coupling adjustment according to Section 7.1. If necessary, calibrate the specific gravity meter function and
set adjusting screws per Sections 7.4 and 7.5. Proceed with calibration following Section 7.3.
NOTE: The specific gravity meter function and the adjusting screws are features offered by the instrument. They enable a user
to perform simulations that ease calibration in situations such as no liquid in low level when special interface displacers are
used and for calibration with or without liquid in case of a level interface application using a standard displacer. If such
conditions are not present, these adjustments are optional.
9.6. REPLACEMENT OF ELECTRONIC AND MECHANICAL COMPONENTS
Replacement of the main electronic module, terminal board, sensor S/A or mechanism S/A must be performed
using high accuracy tools and requires the instrument head to be returned to a GE's Operations.
If the actions done according to Section 10 failed to correct a default, please contact our local After-Sales Department.
If After-Sales support does not enable the device to successfully operate, replacement of a component may be required. In
such case and after approval by our After-Sales Department, remove the 12400 case from torque tube following instructions
given in Section 9.1 and ship it to indicated address.
Parts which constitute the mechanism subassembly (50), including elements (51 to 62) are assembled at the
factory using high precision tools that guarantee highly accurate positioning, which is required to achieve
specified performance. Never disassemble these parts unless a malfunction occurs. The whole sub-assembly
must then be replaced or returned to the factory for rebuild.
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